Geometry and Measures
Line of Symmetry
Rotational Symmetry
Trigonometry
Pythagoras' Theorem and Applications
Trigonometry: Sine, Cosine, Tangent
Cosine Rule
Sine Rule
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Trigonometry: Sine, Cosine, Tangent
Geometry and Measures
Trigonometry: Sine, Cosine, Tangent
ðŸŽ¬ Video Tutorial
Basic Trigonometry:
Sine, cosine, and tangent depend only on the angle $\theta$ in a rightangled triangle; they do not change with the size of the triangle.
Trigonometric Ratios:
$\sin \theta = \frac{\text{opposite}}{\text{hypotenuse}}$, $\cos \theta = \frac{\text{adjacent}}{\text{hypotenuse}}$, $\tan \theta = \frac{\text{opposite}}{\text{adjacent}}$.
Solving for Sides:
Use trigonometric ratios with a known angle and side to find missing sides of the triangle.
Finding Angles:
Find the unknown angle $\theta$ using inverse functions like $\cos^{1}$ on a calculator.
Key Angle Values:
Memorise trigonometric values for common angles (30Â°, 45Â°, 60Â°) to simplify calculations.
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